Initial Checks

• I have searched GitHub for a duplicate issue and I'm sure this is something new
• I have searched Google & StackOverflow for a solution and couldn't find anything
• I have read and followed the docs and still think this is a bug
• I am confident that the issue is with pydantic (not my code, or another library in the ecosystem like FastAPI or mypy)

Description

I noticed that strings are reported without enclosing quotes. This isn't a huge problem but it could cause confusion if given is a string which looks like str(x) for some non-string x. E.g. in the example below I get the same error message when given is the integer 123 and the string '123'.

I haven't looked at the source code, but I would guess there is a format string which ends up calling str(given) instead repr(given). I think I'd prefer the latter, though if given were a complicated object like a a long list or a heavily nested dictionary its repr(...) could be unwieldy.

Example Code

from pydantic import BaseModel, ValidationError
from typing import Literal

class Model(BaseModel):
    field: Literal["hello", "world"]

try:
    Model.parse_obj({"field": 123})
except ValidationError as e:
    print(e)
    # 1 validation error for Model
    # field
    #   unexpected value; permitted: 'hello', 'world' (type=value_error.const; given=123; permitted=('hello', 'world'))


try:
    Model.parse_obj({"field": "123"})
except ValidationError as e:
    print(e)
    # 1 validation error for Model
    # field
    #   unexpected value; permitted: 'hello', 'world' (type=value_error.const; given=123; permitted=('hello', 'world'))

Python, Pydantic & OS Version

pydantic version: 1.9.1
            pydantic compiled: True
                 install path: /home/dmr/.cache/pypoetry/virtualenvs/matrix-synapse-RhMlrixz-py3.10/lib64/python3.10/site-packages/pydantic
               python version: 3.10.6 (main, Aug  2 2022, 00:00:00) [GCC 12.1.1 20220507 (Red Hat 12.1.1-1)]
                     platform: Linux-5.18.18-200.fc36.x86_64-x86_64-with-glibc2.35
     optional deps. installed: ['typing-extensions'

Affected Components

• Compatibility between releases
• Data validation/parsing
• Data serialization - .dict() and .json()
• JSON Schema
• Dataclasses
• Model Config
• Field Types - adding or changing a particular data type
• Function validation decorator
• Generic Models
• Other Model behaviour - construct(), pickling, private attributes, ORM mode
• Plugins and integration with other tools - mypy, FastAPI, python-devtools, Hypothesis, VS Code, PyCharm, etc.